Method and apparatus for performing user equipment triggered semi-persistent scheduling activation in wireless communication system

ABSTRACT

A user equipment (UE) receives a SPS resource configuration from an eNodeB (eNB), and transmits information related to a semi-persistent scheduling (SPS) activation for a specific logical channel to the eNB. The information may include timing information for the specific logical channel which indicates when a SPS resource for the specific logical channel should be activated. The specific logical channel may correspond to a vehicle-to-everything (V2X) communication.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/925,307, filed on Jul. 9, 2020, which is a continuation of U.S.patent application Ser. No. 15/756,968, filed on Mar. 1, 2018, now U.S.Pat. No. 10,721,731, which is the National Stage filing under 35 U.S.C.371 of International Application No. PCT/KR2017/001081, filed on Feb. 1,2017 which claims the benefit of U.S. Provisional Application No.62/290,935, filed on Feb. 3, 2016, the contents of which are allincorporated by reference herein in their entireties.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to wireless communications, and moreparticularly, to a method and apparatus for performing a user equipment(UE) triggered semi-persistent scheduling (SPS) activation in a wirelesscommunication system.

Related Art

3rd generation partnership project (3GPP) long-term evolution (LTE) is atechnology for enabling high-speed packet communications. Many schemeshave been proposed for the LTE objective including those that aim toreduce user and provider costs, improve service quality, and expand andimprove coverage and system capacity. The 3GPP LTE requires reduced costper bit, increased service availability, flexible use of a frequencyband, a simple structure, an open interface, and adequate powerconsumption of a terminal as an upper-level requirement.

The pace of LTE network deployment is accelerating all over the world,which enables more and more advanced services and Internet applicationsmaking use of the inherent benefits of LTE, such as higher data rate,lower latency and enhanced coverage. Widely deployed LTE-based networkprovides the opportunity for the vehicle industry to realize the conceptof ‘connected cars’. By providing a vehicle with an access to the LTEnetwork, a vehicle can be connected to the Internet and other vehiclesso that a broad range of existing or new services can be envisaged.Vehicle manufacturers and cellular network operators show stronginterests in vehicle wireless communications for proximity safetyservices as well as commercial applications. LTE-basedvehicle-to-everything (V2X) study is urgently desired from marketrequirement, and the market for vehicle-to-vehicle (V2V) communicationin particular is time sensitive. There are many research projects andfield tests of connected vehicles in some countries or regions, such asUS/Europe/Japan/Korea.

V2X includes a vehicle-to-vehicle (V2V), covering LTE-basedcommunication between vehicles, vehicle-to-pedestrian (V2P), coveringLTE-based communication between a vehicle and a device carried by anindividual (e.g. handheld terminal carried by a pedestrian, cyclist,driver or passenger), and vehicle-to-infrastructure/network (V2I),covering LTE-based communication between a vehicle and a roadside unit(RSU)/network. A RSU is a transportation infrastructure entity (e.g. anentity transmitting speed notifications) implemented in an eNodeB (eNB)or a stationary UE.

In V2X communication, it is important to reduce the latency so thatdelay-critical data, e.g. decentralized environmental notificationmessage (DENM) or cooperative awareness message (CAM), is transferred intime.

SUMMARY OF THE INVENTION

The present provides a method and apparatus for performing a userequipment (UE) triggered semi-persistent scheduling (SPS) activation ina wireless communication system. The present invention further providesa method and apparatus for performing a UE triggered SPS reactivationand/or release.

In an aspect, a method for performing a semi-persistent scheduling (SPS)activation, by a user equipment (UE), in a wireless communication systemis provided. The method includes receiving a SPS resource configurationfrom an eNodeB (eNB), and transmitting information related to the SPSactivation for a specific logical channel to the eNB.

In another aspect, a user equipment (UE) in a wireless communicationsystem is provided. The UE includes a memory, a transceiver, and aprocessor, coupled to the memory and the transceiver, that controls thetransceiver to receive a SPS resource configuration from an eNodeB(eNB), and controls the transceiver to transmit information related tothe SPS activation for a specific logical channel to the eNB.

A UE can trigger SPS activation, reactivation and/or release.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows LTE system architecture.

FIG. 2 shows a block diagram of architecture of a typical E-UTRAN and atypical EPC.

FIG. 3 shows a block diagram of a user plane protocol stack of an LTEsystem.

FIG. 4 shows a block diagram of a control plane protocol stack of an LTEsystem.

FIG. 5 shows an example of a physical channel structure.

FIG. 6 shows an example of SPS configuration and SPS activation requestaccording to an embodiment of the present invention.

FIG. 7 shows a method for performing a SPS activation by a UE, accordingto an embodiment of the present invention.

FIG. 8 shows a wireless communication system to implement an embodimentof the present invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

The technology described below can be used in various wirelesscommunication systems such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), etc. The CDMA canbe implemented with a radio technology such as universal terrestrialradio access (UTRA) or CDMA-2000. The TDMA can be implemented with aradio technology such as global system for mobile communications(GSM)/general packet ratio service (GPRS)/enhanced data rate for GSMevolution (EDGE). The OFDMA can be implemented with a radio technologysuch as institute of electrical and electronics engineers (IEEE) 802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), etc.IEEE 802.16m is an evolution of IEEE 802.16e, and provides backwardcompatibility with an IEEE 802.16-based system. The UTRA is a part of auniversal mobile telecommunication system (UMTS). 3rd generationpartnership project (3GPP) long term evolution (LTE) is a part of anevolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTE uses the OFDMA indownlink and uses the SC-FDMA in uplink. LTE-advance (LTE-A) is anevolution of the 3GPP LTE.

For clarity, the following description will focus on the LTE-A. However,technical features of the present invention are not limited thereto.

FIG. 1 shows LTE system architecture. The communication network iswidely deployed to provide a variety of communication services such asvoice over internet protocol (VoIP) through IMS and packet data.

Referring to FIG. 1 , the LTE system architecture includes one or moreuser equipment (UE; 10), an evolved-UMTS terrestrial radio accessnetwork (E-UTRAN) and an evolved packet core (EPC). The UE 10 refers toa communication equipment carried by a user. The UE 10 may be fixed ormobile, and may be referred to as another terminology, such as a mobilestation (MS), a user terminal (UT), a subscriber station (SS), awireless device, etc.

The E-UTRAN includes one or more evolved node-B (eNB) 20, and aplurality of UEs may be located in one cell. The eNB 20 provides an endpoint of a control plane and a user plane to the UE 10. The eNB 20 isgenerally a fixed station that communicates with the UE 10 and may bereferred to as another terminology, such as a base station (BS), anaccess point, etc. One eNB 20 may be deployed per cell.

Hereinafter, a downlink (DL) denotes communication from the eNB 20 tothe UE 10, and an uplink (UL) denotes communication from the UE 10 tothe eNB 20. In the DL, a transmitter may be a part of the eNB 20, and areceiver may be a part of the UE 10. In the UL, the transmitter may be apart of the UE 10, and the receiver may be a part of the eNB 20.

The EPC includes a mobility management entity (MME) and a servinggateway (S-GW). The MME/S-GW 30 may be positioned at the end of thenetwork. For clarity, MME/S-GW 30 will be referred to herein simply as a“gateway,” but it is understood that this entity includes both the MMEand S-GW. A packet data network (PDN) gateway (P-GW) may be connected toan external network.

The MME provides various functions including non-access stratum (NAS)signaling to eNBs 20, NAS signaling security, access stratum (AS)security control, inter core network (CN) node signaling for mobilitybetween 3GPP access networks, idle mode UE reachability (includingcontrol and execution of paging retransmission), tracking area listmanagement (for UE in idle and active mode), packet data network (PDN)gateway (P-GW) and S-GW selection, MME selection for handovers with MMEchange, serving GPRS support node (SGSN) selection for handovers to 2Gor 3G 3GPP access networks, roaming, authentication, bearer managementfunctions including dedicated bearer establishment, support for publicwarning system (PWS) (which includes earthquake and tsunami warningsystem (ETWS) and commercial mobile alert system (CMAS)) messagetransmission. The S-GW host provides assorted functions includingper-user based packet filtering (by e.g., deep packet inspection),lawful interception, UE Internet protocol (IP) address allocation,transport level packet marking in the DL, UL and DL service levelcharging, gating and rate enforcement, DL rate enforcement based onaccess point name aggregate maximum bit rate (APN-AMBR).

Interfaces for transmitting user traffic or control traffic may be used.The UE 10 is connected to the eNB 20 via a Uu interface. The eNBs 20 areconnected to each other via an X2 interface. Neighboring eNBs may have ameshed network structure that has the X2 interface. A plurality of nodesmay be connected between the eNB 20 and the gateway 30 via an S1interface.

FIG. 2 shows a block diagram of architecture of a typical E-UTRAN and atypical EPC. Referring to FIG. 2 , the eNB 20 may perform functions ofselection for gateway 30, routing toward the gateway 30 during a radioresource control (RRC) activation, scheduling and transmitting of pagingmessages, scheduling and transmitting of broadcast channel (BCH)information, dynamic allocation of resources to the UEs 10 in both ULand DL, configuration and provisioning of eNB measurements, radio bearercontrol, radio admission control (RAC), and connection mobility controlin LTE ACTIVE state. In the EPC, and as noted above, gateway 30 mayperform functions of paging origination, LTE IDLE state management,ciphering of the user plane, SAE bearer control, and ciphering andintegrity protection of NAS signaling.

FIG. 3 shows a block diagram of a user plane protocol stack of an LTEsystem. FIG. 4 shows a block diagram of a control plane protocol stackof an LTE system. Layers of a radio interface protocol between the UEand the E-UTRAN may be classified into a first layer (L1), a secondlayer (L2), and a third layer (L3) based on the lower three layers ofthe open system interconnection (OSI) model that is well-known in thecommunication system.

A physical (PHY) layer belongs to the L1. The PHY layer provides ahigher layer with an information transfer service through a physicalchannel. The PHY layer is connected to a medium access control (MAC)layer, which is a higher layer of the PHY layer, through a transportchannel. A physical channel is mapped to the transport channel. Databetween the MAC layer and the PHY layer is transferred through thetransport channel. Between different PHY layers, i.e., between a PHYlayer of a transmission side and a PHY layer of a reception side, datais transferred via the physical channel.

A MAC layer, a radio link control (RLC) layer, and a packet dataconvergence protocol (PDCP) layer belong to the L2. The MAC layerprovides services to the RLC layer, which is a higher layer of the MAClayer, via a logical channel. The MAC layer provides data transferservices on logical channels. The RLC layer supports the transmission ofdata with reliability. Meanwhile, a function of the RLC layer may beimplemented with a functional block inside the MAC layer. In this case,the RLC layer may not exist. The PDCP layer provides a function ofheader compression function that reduces unnecessary control informationsuch that data being transmitted by employing IP packets, such as IPv4or Ipv6, can be efficiently transmitted over a radio interface that hasa relatively small bandwidth.

A radio resource control (RRC) layer belongs to the L3. The RLC layer islocated at the lowest portion of the L3, and is only defined in thecontrol plane. The RRC layer controls logical channels, transportchannels, and physical channels in relation to the configuration,reconfiguration, and release of radio bearers (RBs). The RB signifies aservice provided the L2 for data transmission between the UE andE-UTRAN.

Referring to FIG. 3 , the RLC and MAC layers (terminated in the eNB onthe network side) may perform functions such as scheduling, automaticrepeat request (ARQ), and hybrid ARQ (HARM). The PDCP layer (terminatedin the eNB on the network side) may perform the user plane functionssuch as header compression, integrity protection, and ciphering.

Referring to FIG. 4 , the RLC and MAC layers (terminated in the eNB onthe network side) may perform the same functions for the control plane.The RRC layer (terminated in the eNB on the network side) may performfunctions such as broadcasting, paging, RRC connection management, RBcontrol, mobility functions, and UE measurement reporting andcontrolling. The NAS control protocol (terminated in the MME of gatewayon the network side) may perform functions such as a SAE bearermanagement, authentication, LTE IDLE mobility handling, pagingorigination in LTE IDLE, and security control for the signaling betweenthe gateway and UE.

FIG. 5 shows an example of a physical channel structure. A physicalchannel transfers signaling and data between PHY layer of the UE and eNBwith a radio resource. A physical channel consists of a plurality ofsubframes in time domain and a plurality of subcarriers in frequencydomain. One subframe, which is 1 ms, consists of a plurality of symbolsin the time domain. Specific symbol(s) of the subframe, such as thefirst symbol of the subframe, may be used for a physical downlinkcontrol channel (PDCCH). The PDCCH carries dynamic allocated resources,such as a physical resource block (PRB) and modulation and coding scheme(MCS).

A DL transport channel includes a broadcast channel (BCH) used fortransmitting system information, a paging channel (PCH) used for paginga UE, a downlink shared channel (DL-SCH) used for transmitting usertraffic or control signals, a multicast channel (MCH) used for multicastor broadcast service transmission. The DL-SCH supports HARQ, dynamiclink adaptation by varying the modulation, coding and transmit power,and both dynamic and semi-static resource allocation. The DL-SCH alsomay enable broadcast in the entire cell and the use of beamforming.

A UL transport channel includes a random access channel (RACH) normallyused for initial access to a cell, an uplink shared channel (UL-SCH) fortransmitting user traffic or control signals, etc. The UL-SCH supportsHARQ and dynamic link adaptation by varying the transmit power andpotentially modulation and coding. The UL-SCH also may enable the use ofbeamforming.

The logical channels are classified into control channels fortransferring control plane information and traffic channels fortransferring user plane information, according to a type of transmittedinformation. That is, a set of logical channel types is defined fordifferent data transfer services offered by the MAC layer.

The control channels are used for transfer of control plane informationonly. The control channels provided by the MAC layer include a broadcastcontrol channel (BCCH), a paging control channel (PCCH), a commoncontrol channel (CCCH), a multicast control channel (MCCH) and adedicated control channel (DCCH). The BCCH is a downlink channel forbroadcasting system control information. The PCCH is a downlink channelthat transfers paging information and is used when the network does notknow the location cell of a UE. The CCCH is used by UEs having no RRCconnection with the network. The MCCH is a point-to-multipoint downlinkchannel used for transmitting multimedia broadcast multicast services(MBMS) control information from the network to a UE. The DCCH is apoint-to-point bi-directional channel used by UEs having an RRCconnection that transmits dedicated control information between a UE andthe network.

Traffic channels are used for the transfer of user plane informationonly. The traffic channels provided by the MAC layer include a dedicatedtraffic channel (DTCH) and a multicast traffic channel (MTCH). The DTCHis a point-to-point channel, dedicated to one UE for the transfer ofuser information and can exist in both uplink and downlink. The MTCH isa point-to-multipoint downlink channel for transmitting traffic datafrom the network to the UE.

Uplink connections between logical channels and transport channelsinclude the DCCH that can be mapped to the UL-SCH, the DTCH that can bemapped to the UL-SCH and the CCCH that can be mapped to the UL-SCH.Downlink connections between logical channels and transport channelsinclude the BCCH that can be mapped to the BCH or DL-SCH, the PCCH thatcan be mapped to the PCH, the DCCH that can be mapped to the DL-SCH, andthe DTCH that can be mapped to the DL-SCH, the MCCH that can be mappedto the MCH, and the MTCH that can be mapped to the MCH.

An RRC state indicates whether an RRC layer of the UE is logicallyconnected to an RRC layer of the E-UTRAN. The RRC state may be dividedinto two different states such as an RRC idle state (RRC_IDLE) and anRRC connected state (RRC_CONNECTED). In RRC_IDLE, the UE may receivebroadcasts of system information and paging information while the UEspecifies a discontinuous reception (DRX) configured by NAS, and the UEhas been allocated an identification (ID) which uniquely identifies theUE in a tracking area and may perform public land mobile network (PLMN)selection and cell re-selection. Also, in RRC_IDLE, no RRC context isstored in the eNB.

In RRC_CONNECTED, the UE has an E-UTRAN RRC connection and a context inthe E-UTRAN, such that transmitting and/or receiving data to/from theeNB becomes possible. Also, the UE can report channel qualityinformation and feedback information to the eNB. In RRC_CONNECTED, theE-UTRAN knows the cell to which the UE belongs. Therefore, the networkcan transmit and/or receive data to/from UE, the network can controlmobility (handover and inter-radio access technologies (RAT) cell changeorder to GSM EDGE radio access network (GERAN) with network assistedcell change (NACC)) of the UE, and the network can perform cellmeasurements for a neighboring cell.

In RRC_IDLE, the UE specifies the paging DRX cycle. Specifically, the UEmonitors a paging signal at a specific paging occasion of every UEspecific paging DRX cycle. The paging occasion is a time interval duringwhich a paging signal is transmitted. The UE has its own pagingoccasion. A paging message is transmitted over all cells belonging tothe same tracking area. If the UE moves from one tracking area (TA) toanother TA, the UE will send a tracking area update (TAU) message to thenetwork to update its location.

Semi-persistent scheduling (SPS) is described. E-UTRAN can allocatesemi-persistent DL resources for the first HARQ transmissions to UEs.RRC defines the periodicity of the semi-persistent DL grant. PDCCHindicates whether the DL grant is a semi-persistent one, i.e. whether itcan be implicitly reused in the following TTIs according to theperiodicity defined by RRC.

When required, retransmissions are explicitly signaled via the PDCCH(s).In the subframes where the UE has semi-persistent DL resource, if the UEcannot find its cell radio network temporary identity (C-RNTI) on thePDCCH(s), a DL transmission according to the semi-persistent allocationthat the UE has been assigned in the TTI is assumed. Otherwise, in thesubframes where the UE has semi-persistent DL resource, if the UE findsits C-RNTI on the PDCCH(s), the PDCCH allocation overrides thesemi-persistent allocation for that TTI and the UE does not decode thesemi-persistent resources.

When carrier aggregation (CA) is configured, semi-persistent DLresources can only be configured for the primary cell (PCell) and onlyPDCCH allocations for the PCell can override the semi-persistentallocation. When dual connectivity (DC) is configured, semi-persistentDL resources can only be configured for the PCell or primary secondarycell (PSCell). Only PDCCH allocations for the PCell can override thesemi-persistent allocation for PCell and only PDCCH allocations for thePSCell can override the semi-persistent allocation for PSCell.

In addition, E-UTRAN can allocate a semi-persistent UL resource for thefirst HARQ transmissions and potentially retransmissions to UEs. RRCdefines the periodicity of the semi-persistent UL grant. PDCCH indicateswhether the UL grant is a semi-persistent one, i.e. whether it can beimplicitly reused in the following TTIs according to the periodicitydefined by RRC.

In the subframes where the UE has semi-persistent UL resource, if the UEcannot find its C-RNTI on the PDCCH(s), a UL transmission according tothe semi-persistent allocation that the UE has been assigned in the TTIcan be made. The network performs decoding of the pre-defined PRBsaccording to the pre-defined MCS. Otherwise, in the subframes where theUE has semi-persistent UL resource, if the UE finds its C-RNTI on thePDCCH(s), the PDCCH allocation overrides the persistent allocation forthat TTI and the UE's transmission follows the PDCCH allocation, not thesemi-persistent allocation. Retransmissions are either implicitlyallocated in which case the UE uses the semi-persistent UL allocation,or explicitly allocated via PDCCH(s) in which case the UE does notfollow the semi-persistent allocation.

Similarly as for the DL, semi-persistent UL resources can only beconfigured for the PCell and only PDCCH allocations for the PCell canoverride the semi-persistent allocation. When DC is configured,semi-persistent UL resources can only be configured for the PCell orPSCell. Only PDCCH allocations for the PCell can override thesemi-persistent allocation for PCell and only PDCCH allocations for thePSCell can override the semi-persistent allocation for PSCell.

When SPS is enabled by RRC, the following information is provided:

-   -   SPS C-RNTI;    -   UL SPS interval semiPersistSchedIntervalUL and number of empty        transmissions before implicit release implicitReleaseAfter, if        SPS is enabled for the UL;    -   Whether twoIntervalsConfig is enabled or disabled for UL, only        for time division duplex (TDD);    -   DL SPS interval semiPersistSchedIntervalDL and number of        configured HARQ processes for SPS numberOfConfSPS-Processes, if        SPS is enabled for the DL;

When SPS for UL or DL is disabled by RRC, the corresponding configuredgrant or configured assignment shall be discarded.

The above information may be carried in SPS-Config information element(IE). The IE SPS-Config is used to specify the SPS configuration. Table1 shows the SPS-Config IE.

TABLE 1 -- ASN1START SPS-Config ::= SEQUENCE {  semiPersistSchedC-RNTI  C-RNTI  OPTIONAL, -- Need OR  sps-ConfigDL   SPS-ConfigDL  OPTIONAL,-- Need ON  sps-ConfigUL   SPS-ConfigUL  OPTIONAL -- Need ON }SPS-ConfigDL ::= CHOICE{  release    NULL,  setup    SEQUENCE {  semiPersistSchedIntervalDL    ENUMERATED {  sf10, sf20, sf32, sf40,sf64, sf80,  sf128, sf160, sf320, sf640, spare6,  spare5, spare4,spare3, spare2,  spare1},   numberOfConfSPS-Processes    INTEGER (1..8),  n1PUCCH-AN-PersistentList    N1PUCCH-AN- PersistentList,   ...,   [[twoAntennaPortActivated-r10    CHOICE {  release  NULL,  setup  SEQUENCE{ n1PUCCH-AN-PersistentListP1-r10  N1PUCCH-AN-PersistentList  } }   OPTIONAL -- Need ON   ]]  } } SPS-ConfigUL ::= CHOICE {  release   NULL,  setup    SEQUENCE {   semiPersistSchedIntervalUL    ENUMERATED{  sf10, sf20, sf32, sf40, sf64, sf80,  sf128, sf160, sf320, sf640,spare6,  spare5, spare4, spare3, spare2,  spare1},  implicitReleaseAfter    ENUMERATED {e2, e3, e4, e8},   p0-Persistent    SEQUENCE { p0-NominalPUSCH-Persistent     INTEGER (− 126..24),p0-UE-PUSCH-Persistent  INTEGER (−8..7)   }  OPTIONAL,  -- Need OP  twoIntervalsConfig  ENUMERATED {true}  OPTIONAL, -- Cond TDD   ...,  [[ p0-PersistentSubframeSet2-r12    CHOICE {  release  NULL,  setup SEQUENCE { p0-NominalPUSCH-PersistentSubframeSet2-r12   INTEGER(−126..24), p0-UE-PUSCH-PersistentSubframeSet2-r12 INTEGER (−8..7)  } }  OPTIONAL -- Need ON   ]]  } } N1PUCCH-AN-PersistentList ::=  SEQUENCE(SIZE(1..4)) OF INTEGER (0..2047) -- ASN1STOP

As described above, the SPS-Config IE may include at least one of SPSC-RNTI (semiPersistSchedC-RNTI), UL SPS interval(semiPersistSchedIntervalUL) and number of empty transmissions beforeimplicit release (implicitReleaseAfter), whether twoIntervalsConfig isenabled or disabled for UL (twoIntervalsConfig), and DL SPS interval(semiPersistSchedIntervalDL) and number of configured HARQ processes forSPS (numberOfConfSPS-Processes), if SPS is enabled for the DL.

The SPS-Config IE may be included in RadioResourceConfigDedicated IE.The IE RadioResourceConfigDedicated is used to setup/modify/release RBs,to modify the MAC main configuration, to modify the SPS configurationand to modify dedicated physical configuration. TheRadioResourceConfigDedicated IE may be included in one ofRRCConnectionReconfiguration message, RRCConnectionReestablishmentmessage, or RRCConnectionSetup message. Table 2 shows TheRadioResourceConfigDedicated IE.

TABLE 2 -- ASN1START RadioResourceConfigDedicated ::= SEQUENCE { srb-ToAddModList SRB-ToAddModList OPTIONAL,  -- Cond HO-Conn drb-ToAddModList DRB-ToAddModList OPTIONAL,  -- Cond HO-toEUTRA drb-ToReleaseList DRB-ToReleaseList OPTIONAL,  -- Need ON mac-MainConfig  CHOICE {  explicitValue  MAC- MainConfig,  defaultValue NULL  }  OPTIONAL,  -- Cond HO- toEUTRA2  sps-Config  SPS-ConfigOPTIONAL, -- Need ON  physicalConfigDedicated  PhysicalConfigDedicatedOPTIONAL,  -- Need ON  ...,  [[ rlf-TimersAndConstants-r9RLF-TimersAndConstants-r9 OPTIONAL -- Need ON  ]],  [[measSubframePatternPCell-r10 MeasSubframePatternPCell-r10  OPTIONAL  --Need ON  ]],  [[ neighCellsCRS-Info-r11 NeighCellsCRS-Info-r11  OPTIONAL -- Need ON  ]],  [[ naics-Info-r12 NAICS-AssistanceInfo-r12 OPTIONAL --Need ON  ]]} RadioResourceConfigDedicatedPSCell-r12 ::= SEQUENCE {  --UE specific configuration extensions applicable for an PSCell physicalConfigDedicatedPSCell-r12 PhysicalConfigDedicated  OPTIONAL, -- Need ON  sps-Config-r12  SPS-Config OPTIONAL, -- Need ON naics-Info-r12  NAICS- AssistanceInfo-r12-  OPTIONAL,  -- Need ON  ...}

Referring to Table 2, the RadioResourceConfigDedicated IE may includeThe SPS-Config IE. Except for handover or releasing SPS for master cellgroup (MCG), E-UTRAN does not reconfigure SPS-Config for MCG when thereis a configured DL assignment or a configured UL grant for MCG. Exceptfor SCG change or releasing SPS for SCG, E-UTRAN does not reconfigureSPS-Config for SCG when there is a configured DL assignment or aconfigured UL grant for SCG.

After a SPS DL assignment is configured, the MAC entity shall considersequentially that the N^(th) assignment occurs in the subframe forwhich:

−(10*SFN+subframe)=[(10*SFN_(start time)+subframe_(start time))+N*semiPersistSchedIntervalDL]modulo 10240,

where SFN_(start time) and subframe_(start time) are the system framenumber (SFN) and subframe, respectively, at the time the configured DLassignment were (re-)initialized.

After a SPS UL grant is configured, the MAC entity shall:

1> if twoIntervalsConfig is enabled by upper layer:

2> set the Subframe_Offset according to Table 3 below.

TABLE 3 TDD UL/DL Position of initial Subframe_Offset valueconfiguration Semi-Persistent grant (ms) 0 N/A 0 1 Subframes 2 and 7 1Subframes 3 and 8 −1 2 Subframe 2 5 Subframe 7 −5 3 Subframes 2 and 3 1Subframe 4 −2 4 Subframe 2 1 Subframe 3 −1 5 N/A 0 6 N/A 0

1> else:

2> set Subframe_Offset to 0.

1> consider sequentially that the N^(th) grant occurs in the subframefor which:

2>(10*SFN+subframe)=[(10*SFN_(start time)+subframe_(start time))N*semiPersistSchedIntervalUL+Subframe_Offset*(Nmodulo 2)] modulo 10240,

where SFN_(start time) and subframe_(start time) are the SFN andsubframe, respectively, at the time the configured uplink grant were(re-)initialized.

The MAC entity shall clear the configured UL grant immediately afterimplicitReleaseAfter number of consecutive new MAC PDUs each containingzero MAC SDUs have been provided by the multiplexing and assemblyentity, on the SPS resource.

Vehicle-to-everything (V2X) communication is described. V2Xcommunication contains three different types, which arevehicle-to-vehicle (V2V) communications, vehicle-to-infrastructure (V2I)communications, and vehicle-to-pedestrian (V2P) communications. Thesethree types of V2X can use “co-operative awareness” to provide moreintelligent services for end-users. This means that transport entities,such as vehicles, roadside infrastructure, and pedestrians, can collectknowledge of their local environment (e.g. information received fromother vehicles or sensor equipment in proximity) to process and sharethat knowledge in order to provide more intelligent services, such ascooperative collision warning or autonomous driving.

V2X service is a type of communication service that involves atransmitting or receiving UE using V2V application via 3GPP transport.Based on the other party involved in the communication, it can befurther divided into V2V service, V2I service, V2P service, andvehicle-to-network (V2N) service. V2V service is a type of V2X service,where both parties of the communication are UEs using V2V application.V2I service is a type of V2X Service, where one party is a UE and theother party is a road side unit (RSU) both using V2I application. TheRSU is an entity supporting V2I service that can transmit to, andreceive from a UE using V2I application. RSU is implemented in an eNB ora stationary UE. V2P service is a type of V2X service, where bothparties of the communication are UEs using V2P application. V2N serviceis a type of V2X Service, where one party is a UE and the other party isa serving entity, both using V2N applications and communicating witheach other via LTE network entities.

For V2V, E-UTRAN allows such UEs that are in proximity of each other toexchange V2V-related information using E-UTRA(N) when permission,authorization and proximity criteria are fulfilled. The proximitycriteria can be configured by the mobile network operator (MNO).However, UEs supporting V2V service can exchange such information whenserved by or not served by E-UTRAN which supports V2X Service. The UEsupporting V2V applications transmits application layer information(e.g. about its location, dynamics, and attributes as part of the V2Vservice). The V2V payload must be flexible in order to accommodatedifferent information contents, and the information can be transmittedperiodically according to a configuration provided by the MNO. V2V ispredominantly broadcast-based. V2V includes the exchange of V2V-relatedapplication information between distinct UEs directly and/or, due to thelimited direct communication range of V2V, the exchange of V2V-relatedapplication information between distinct UEs via infrastructuresupporting V2X service, e.g., RSU, application server, etc.

For V2I, the UE supporting V2I applications sends application layerinformation to RSU. RSU sends application layer information to a groupof UEs or a UE supporting V2I applications. V2N is also introduced whereone party is a UE and the other party is a serving entity, bothsupporting V2N applications and communicating with each other via LTEnetwork.

For V2P, E-UTRAN allows such UEs that are in proximity of each other toexchange V2P-related information using E-UTRAN when permission,authorization and proximity criteria are fulfilled. The proximitycriteria can be configured by the MNO. However, UEs supporting V2Pservice can exchange such information even when not served by E-UTRANwhich supports V2X Service. The UE supporting V2P applications transmitsapplication layer information. Such information can be broadcast by avehicle with UE supporting V2X service (e.g., warning to pedestrian),and/or by a pedestrian with UE supporting V2X service (e.g., warning tovehicle). V2P includes the exchange of V2P-related applicationinformation between distinct UEs (one for vehicle and the other forpedestrian) directly and/or, due to the limited direct communicationrange of V2P, the exchange of V2P-related application informationbetween distinct UEs via infrastructure supporting V2X service, e.g.,RSU, application server, etc.

According to conventional art, UL transmission using SPS may cause somedelay if the gap between generation of user data and the configured SPSresource is big. Thus, if SPS is used for delay sensitive traffic suchas V2X communication, SPS scheduling interval should be small enough tosupport delay requirement. However, smaller SPS scheduling interval maylead to more overhead, because the UE may not fully utilize theconfigured SPS resources. Accordingly, the gap between generation ofuser data and the configured SPS resource should be small while the SPSscheduling interval should be fit in order to satisfy delay requirement.Currently, there is no mechanism to support this functionality.

Therefore, a method for performing UE triggered SPS activation,reactivation, and/or release according to the present invention isproposed. According to an embodiment of the present invention, the UEmay receive SPS configuration for one or more specific logical channels.The UE may receive the SPS configuration for the specific logicalchannel via system information, RRC connection setup message, RRCconnection re-establishment message, or RRC connection release message.When data becomes available for the specific logical channel(s), the UEmay request SPS activation to the eNB and then perform UL transmissionby using the configured SPS resources, depending on SPS activationcommand received from the eNB. The UE may transmit the SPS activationrequest to the eNB on physical uplink control channel (PUCCH), MACcontrol element (CE), or RRC message. That is, the UE may transmit theSPS activation request to the eNB by using control resources used torequest SPS activation. The control resources may be PUCCH resources,random access resources, or new UL control channel resources. Further,the UE may transmit the SPS activation request to the eNB e.g. duringRRC connection (re-)establishment, during handover, after handovercomplete, or in RRC_CONNECTED.

Since the UE actively requests SPS activation to the eNB when there isUL data to be transmitted, the gap between generation of UL data and theconfigured SPS resource can be reduced.

In another embodiment of the present invention, the UE may receive SPSconfiguration for a specific PDN or for a specific service/applicationsuch as V2X communication. The UE may receive the SPS for the specificPDN or for the specific service/application via system information, RRCconnection setup message, RRC connection re-establishment message, orRRC connection release message. When data becomes available for thespecific PDN or for specific the service/application, while in RRC_IDLEstate or RRC suspended state, the NAS layer of the UE may trigger RRCconnection (Re-)establishment with establishment cause set toperiodical/SPS resource request. The UE may request SPS activation tothe eNB in the RRC connection (re-establishment) request message andthen perform UL transmission by using the configured SPS resources,depending on SPS activation command received from the eNB.

FIG. 6 shows an example of SPS configuration and SPS activation requestaccording to an embodiment of the present invention. FIG. 6 shows howthe eNB/UE configures and activate SPS resources according to anembodiment of the present invention. In this embodiment, the UE may bein any RRC state, i.e. RRC_CONNECTED, RRC_IDLE or RRC suspended state.In this embodiment, the SPS resources may be exclusively used for V2Xcommunication or V2X related channel. For example, SPS resources may beonly used to send V2X messages, so that the SPS resources may be grantedonly to carry data via one or more specific channel, e.g. a logicalchannel configured to send V2X messages.

1. Step 1

The eNB provides an SPS configuration (SPS-Config) to the UE by RRCsignaling.

The SPS-Config may include at least one piece of the followinginformation.

-   -   Time/Frequency information of the SPS resources    -   Interval of the SPS resources, i.e. SPS scheduling interval    -   SPS C-RNTI (which can be dedicated to one or more specific        logical channels, e.g. for V2X communication)    -   Validity duration (SPSValidDuration) in which the SPS-Config is        valid in a unit of e.g. subframes, radio frames, milliseconds,        or seconds,    -   List of at least one cell (SPSCellList) in which the SPS-Config        is valid.    -   Logical channel identifier(s) which is subject to the        SPS-Config, i.e. the specific logical channel(s). In other        words, only UL data from logical channels indicated by the        logical channel identifier can be transmitted by using the SPS        resources. UL data from other logical channels cannot be        transmitted by using the SPS resources.

The RRC signaling may be system information, RRC connection setupmessage or RRC connection reconfiguration message or RRC connectionrelease message. If the UE is in RRC_IDLE, the UE may receive theSPS-Config via system information. Alternatively, if the UE is inRRC_CONNECTED, the UE may receive via RRC connection setup message, RRCconnection reconfiguration message, or RRC connection release message.The UE may keep the SPS-Config when the UE moves to RRC_IDLE. So, theSPS-Config may be stored in the UE in RRC_IDLE.

Upon receiving the SPS-Config by RRC signaling, the UE may(re-)configure SPS resources including frequency information of the SPSresources, PUCCH for SPS scheduling information, SPS C-RNTI, SPSscheduling interval and SPSCellList. But, the UE may not determine timeinformation of the SPS resources including SPS time offset, until SPS isactivated.

2. Step 2

When UL data becomes available for specific logical channel(s), specificPDN, or specific service/application, the UE triggers a schedulingrequest (SR) in order to activate SPS. The SR may be for the specificlogical channel(s), for the specific PDN, or specificservice/application. For example, the SR may be specific to V2Xcommunication, or specific to this SPS operation.

The UE may transmit the SR via PUCCH. The SR may be used to request SPSactivation to the eNB. The SR on PUCCH may also be used to inform theeNB about the amount of UL data available for transmission over thespecific logical channel(s). Subsequently, the UE may transmit UL-SCHincluding buffer status report (BSR) MAC CE which can be specific to thespecific logical channel(s), a specific logical channel group, specificto the V2X communication, or specific to this SPS operation. The UE mayalso indicate SPS timing to the eNB together with the BSR MAC CE.

Alternatively, the UE may transmit the SR via random access. In thiscase, random access preamble (i.e. Msg 1 in random access) or scheduledtransmission on UL-SCH (i.e. Msg 3 in random access) may be used torequest SPS activation to the eNB. The Msg 1 or Msg 3 may also informthe eNB about the amount of UL data available for transmission over thespecific logical channel(s). The Msg 3 may include MAC CE such as BSRMAC CE to inform the eNB about the amount of UL data available fortransmission over the specific logical channel(s). The MAC CE may beused to activate SPS. The MAC CE may be specific to the specific logicalchannel(s), a specific logical channel group, specific to the V2Xcommunication, or specific to this SPS operation. The UE may alsoindicate SPS timing to the eNB together with the MAC CE.

The SPS timing is used to indicate to the eNB when SPS should beactivated. The SPS timing may directly indicate SFN number and subframenumber, both of which correspond to when SPS should be activated.Alternatively, the SPS timing may indicate delayed time beforetransmitting the SPS timing. For example, the delayed time beforetransmitting the SPS timing may be time interval between SR triggeringtiming and MAC CE transmission timing.

Operation of step 2 will be described in detail per RRC state. Theoperation of step 2 may be applied to any RRC state.

(1) When the UE is in RRC_IDLE

When UL data becomes available for specific logical channel(s), specificPDN, or specific service/application (e.g. V2X communication), and whenthe SPS-Config is available for the serving cell (since the UE receivesSPS-Config via system information or RRC connection release message),the UE triggers connection establishment and transmits a message to theeNB in order to activate SPS resources. The message may include at leastone of the followings. The message may correspond to RRC connectionrequest message, RRC connection resume request message or RRC connectionreestablishment request message.

-   -   UE ID, such as system architecture evolution (SAE) temporary        mobile subscriber identity (S-TMSI) or C-RNTI; or    -   Cell ID, such as physical cell ID, corresponding to a cell which        allocates the C-RNTI; or    -   SPS activation request and/or V2X indication e.g. in        establishment cause; or    -   Resume ID (if the UE suspends data RBs (DRBs))    -   SPS timing

(2) When the UE is in RRC_CONNECTED: The UE in RRC_CONNECTED may receivea handover command (e.g. RRC connection reconfiguration message withmobility control information) or the UE may select another cell withouta handover command regardless of RRC state.

When UL data becomes available for specific logical channel(s), specificPDN, or specific service/application (e.g. V2X communication), and whenthe SPS-Config is available for the serving cell (since the UE receivesSPS-Config via system information or handover command), if the UE is notin the target cell, the UE performs UL transmission by using the SPSresource towards the source cell. For example, before the UE issynchronized to DL of the target cell or before the UE performs randomaccess towards the target cell, the UE may perform UL transmission byusing the SPS resource towards the source cell.

When UL data becomes available for specific logical channel(s), specificPDN, or specific service/application (e.g. V2X communication), and whenthe SPS-Config is available for the serving cell (since the UE receivesSPS-Config via system information or handover command), if the UE is inthe target cell, the UE transmits a handover complete message to thetarget cell in order to activate SPS resources. For example, after theUE is synchronized to the target cell or after the UE performs randomaccess towards the target cell, the UE may transmit a handover completemessage to the target cell in order to activate SPS resources. Thetarget cell may transmit a handover command to the source cell. Thehandover command may include UE's C-RNTI and UE's SPS C-RNTI which ofboth are used at the target cell. The handover complete message mayinclude at least one of the followings. The handover complete messagemay correspond to RRC connection reconfiguration complete message, RRCconnection request message, RRC connection resume request message or RRCconnection reestablishment request message.

-   -   UE ID, such as C-RNTI (allocated either by the source cell or        target cell), e.g. in C-RNTI MAC CE; or    -   Cell ID, such as physical cell ID, corresponding to a cell which        allocates the C-RNTI; or    -   SPS activation request and/or V2X indication e.g. in        establishment cause; or    -   Resume ID (if the UE suspends DRBs)    -   SPS timing

Meanwhile, the above operation of step 2 may be performed when the UEwants to request SPS reactivation, e.g. when SPS timing needs to beadjusted. Thus, the UE may also transmit the SPS activation request forSPS reactivation. Upon receiving the SPS activation command (i.e. SPSre-activation command), the UE may replace old SPS resources with newSPS resources. For example, time offset may be replaced by the SPSre-activation command.

3. Step 3

Upon receiving the SPS activation request from the UE, the eNB transmitsa SPS activation command to the UE to activate SPS. The SPS activationrequest may be received via a scheduling request on PUCCH or RRCmessages, such as RRC connection request message, RRC connection resumerequest message, RRC connection reconfiguration complete message, RRCconnection reestablishment request message, or handover completemessage, etc. The SPS activation command may correspond to PDCCHaddressing UE's C-RNTI or SPS C-RNTI, MAC CE, or RRC messages, such asRRC connection setup message, RRC connection reestablishment message,etc. The SPS activation command may also indicate when SPS is activatedfor the UE. For example, the SPS activation command may indicate SPStime offset, which corresponds time interval between transmission of theSPS activation command and the first SPS transmission.

The SPS activation command on PDCCH addressed by SPS C-RNTI may grant ULresource to the UE. The UL resource may be allocated before the firstSPS transmission occurs, and the UL resource may be independent from theSPS resources. The UL resource may be used for data available fortransmission over the specific logical channel(s). The UL resource maycorrespond to a single UL transmission including subsequent HARQre-transmissions.

4. Step 4

Upon receiving the SPS activation command from the eNB, the UE(configures and) activates SPS transmissions by using the SPS-Config. Ifthe SPS activation command explicitly indicates when SPS is activated,i.e. SPS time offset, the UE may activate SPS transmission according tothe explicit SPS time offset. Otherwise, the SPS time offset may bedetermined as Nth subframe from the subframe where the SPS activationcommand is received. The N value may be signaled by RRC message orpre-fixed.

The UE may continue to perform UL transmission by using SPS resourcesconfigured by the SPS-Config. The UE may use the SPS resourcesconfigured by the SPS-Config only if the UE considers the SPS-Config asvalid. In order to determine whether the SPS-Config is valid or not, theUE may use SPSValidDuration and/or SPSCellList included in theSPS-Config.

The specific logical channel may correspond to DRB or signaling radiobearer (DRB). The UE may suspend the DRB for the specific logicalchannel and then resume the DRB when SPS is activated, i.e. when the SPSactivation command is received.

5. Step 5

The UE may request SPS release (or deactivation) by using one of SR (onPUCCH or random access), L1 UL control information, MAC CE or RRCmessages. Upon receiving the SPS release request (or deactivationrequest), the eNB may transmit a SPS release command (or deactivationcommand) to the UE. The SPS release command (or deactivation command)may correspond to PDCCH addressing UE's C-RNTI or SPS C-RNTI, MAC CE, orRRC messages, such as RRC connection setup message, RRC connectionreestablishment message. Upon receiving the SPS release command (ordeactivation command), the UE may release the configured SPS resourcesand stop using the configured SPS resources.

FIG. 7 shows a method for performing a SPS activation by a UE, accordingto an embodiment of the present invention. The present inventiondescribed above may be applied to this embodiment.

In step S100, the UE receives a SPS resource configuration from the eNB.The SPS resource configuration may be for one of the specific logicalchannel, a specific PDN, a specific application or a specific service.The specific logical channel, the specific PDN, the specific applicationor the specific service corresponds to V2X communication. The SPSresource configuration includes a logical channel identifier whichindicates the specific logical channel subject to the SPS resourceconfiguration.

In step S110, the UE transmits information related to the SPS activationfor a specific logical channel to the eNB. The information may include arequest for the SPS activation, i.e. SPS activation request. Theinformation may be transmitted via a SR on one of a PUCCH, MAC CE or aRRC message. The information may include timing information for thespecific logical channel. The timing information may indicate when a SPSresource for the specific logical channel should be activated. Thetiming information may include at least one of a SFN or a subframenumber.

The UE may further receive a SPS activation command from the eNB. TheSPS activation command may include a SPS time offset which indicateswhen a SPS resource is activated. The SPS activation command on a PDCCHaddressed by a SPS C-RNTI may grant UL resource. Upon receiving the SPSactivation command, the UE may further perform UL transmission to theeNB by using a SPS resource configured by the SPS resourceconfiguration. Further, the NAS layer of the UE may trigger a connectionestablishment.

FIG. 8 shows a wireless communication system to implement an embodimentof the present invention.

An eNB 800 includes a processor 810, a memory 820 and a transceiver 830.The processor 810 may be configured to implement proposed functions,procedures and/or methods described in this description. Layers of theradio interface protocol may be implemented in the processor 810. Thememory 820 is operatively coupled with the processor 810 and stores avariety of information to operate the processor 810. The transceiver 830is operatively coupled with the processor 810, and transmits and/orreceives a radio signal.

A UE 900 includes a processor 910, a memory 920 and a transceiver 930.The processor 910 may be configured to implement proposed functions,procedures and/or methods described in this description. Layers of theradio interface protocol may be implemented in the processor 910. Thememory 920 is operatively coupled with the processor 910 and stores avariety of information to operate the processor 910. The transceiver 930is operatively coupled with the processor 910, and transmits and/orreceives a radio signal.

The processors 810, 910 may include application-specific integratedcircuit (ASIC), other chipset, logic circuit and/or data processingdevice. The memories 820, 920 may include read-only memory (ROM), randomaccess memory (RAM), flash memory, memory card, storage medium and/orother storage device. The transceivers 830, 930 may include basebandcircuitry to process radio frequency signals. When the embodiments areimplemented in software, the techniques described herein can beimplemented with modules (e.g., procedures, functions, and so on) thatperform the functions described herein. The modules can be stored inmemories 820, 920 and executed by processors 810, 910. The memories 820,920 can be implemented within the processors 810, 910 or external to theprocessors 810, 910 in which case those can be communicatively coupledto the processors 810, 910 via various means as is known in the art.

In view of the exemplary systems described herein, methodologies thatmay be implemented in accordance with the disclosed subject matter havebeen described with reference to several flow diagrams. While forpurposed of simplicity, the methodologies are shown and described as aseries of steps or blocks, it is to be understood and appreciated thatthe claimed subject matter is not limited by the order of the steps orblocks, as some steps may occur in different orders or concurrently withother steps from what is depicted and described herein. Moreover, oneskilled in the art would understand that the steps illustrated in theflow diagram are not exclusive and other steps may be included or one ormore of the steps in the example flow diagram may be deleted withoutaffecting the scope and spirit of the present disclosure.

What is claimed is:
 1. A method performed by a user equipment (UE) in awireless communication system, the method comprising: receiving, from anetwork, a configuration for configured grants comprising a periodicityof the configured grants; transmitting, to the network, a first messagecomprising first traffic information informing a first timing of trafficbeing available in a logical channel; transmitting, to the network, asecond message comprising second traffic information informing a secondtiming of traffic being available in the logical channel upon a changeof the first traffic information; and performing an uplink transmissionto the network on the configured grants based on the periodicity,wherein the first traffic information and the second traffic informationare different from the periodicity in the configuration.
 2. The methodof claim 1, wherein the first timing and the second timing are relatedto when a configured grant for the logical channel based on theconfiguration should be activated.
 3. The method of claim 1, wherein thefirst message or the second message includes a request for configuredgrant activation.
 4. The method of claim 1, wherein the first message orthe second message is transmitted via one of a scheduling request (SR)on a physical uplink control channel (PUCCH), a media access control(MAC) control element (CE) or a radio resource control (RRC) message. 5.The method of claim 1, wherein the configuration is related to one ofthe logical channel, a packet data network (PDN), an application or aservice.
 6. The method of claim 5, wherein the logical channel, the PDN,the application or the service is related to a vehicle-to-everything(V2X) communication.
 7. The method of claim 1, wherein the configurationincludes a logical channel identifier which indicates the logicalchannel subject to the configuration.
 8. The method of claim 1, furthercomprising receiving an activation command for the configured grantsfrom the network.
 9. The method of claim 8, wherein the activationcommand includes information for when the configured grants areactivated.
 10. The method of claim 8, wherein the activation command isidentified by a physical downlink control channel (PDCCH) addressed by aradio network temporary identifier (RNTI).
 11. The method of claim 8,wherein performing the uplink transmission comprises performing theuplink transmission to the network upon receiving the activationcommand.
 12. The method of claim 1, further comprising triggering, by anon-access stratum (NAS) layer of the UE, a connection establishment.13. A user equipment (UE) in a wireless communication system, the UEcomprising: a transceiver; at least one processor; and at least onememory operatively coupled to the at least one processor and storinginstructions that, based on being executed by the at least oneprocessor, perform operations comprising: receiving, from a network, aconfiguration for configured grants comprising a periodicity of theconfigured grants; transmitting, to the network, a first messagecomprising first traffic information informing a first timing of trafficbeing available in a logical channel; transmitting, to the network, asecond message comprising second traffic information informing a secondtiming of traffic being available in the logical channel upon a changeof the first traffic information; and performing an uplink transmissionto the network on the configured grants based on the periodicity,wherein the first traffic information and the second traffic informationare different from the periodicity in the configuration.
 14. Anon-transitory computer-readable medium having stored thereon aplurality of instructions, wherein the plurality of instructions, whenexecuted by a processor of a user equipment (UE), cause the UE to:receive, from a network, a configuration for configured grantscomprising a periodicity of the configured grants; transmit, to thenetwork, a first message comprising first traffic information informinga first timing of traffic being available in a logical channel;transmit, to the network, a second message comprising second trafficinformation informing a second timing of traffic being available in thelogical channel upon a change of the first traffic information; andperform an uplink transmission to the network on the configured grantsbased on the periodicity, wherein the first traffic information and thesecond traffic information are different from the periodicity in theconfiguration.